diff --git a/Models/Invoice.php b/Models/Invoice.php
index f6cdf86..622da65 100644
--- a/Models/Invoice.php
+++ b/Models/Invoice.php
@@ -98,7 +98,7 @@ class Invoice implements \JsonSerializable
     /**
      * Person refering for this order.
      *
-     * @var \DateTime
+     * @var int
      * @since 1.0.0
      */
     private $referer = 0;
@@ -385,14 +385,14 @@ class Invoice implements \JsonSerializable
         return $this->insurance;
     }
 
-    public function setFreight(Money $freigth) /* : void */
+    public function setFreight(Money $freight) /* : void */
     {
         $this->freight = $freight;
     }
 
-    public function getFreigth() : Money
+    public function getFreight() : Money
     {
-        return $this->freigth;
+        return $this->freight;
     }
 
     public function getNet() : Money
diff --git a/Models/InvoiceElement.php b/Models/InvoiceElement.php
index 596b581..a0b8fd7 100644
--- a/Models/InvoiceElement.php
+++ b/Models/InvoiceElement.php
@@ -55,7 +55,7 @@ class InvoiceElement implements \JsonSerializable
 
     private $totalPriceNet = null;
 
-    private $taxP = 0;
+    private $taxP = null;
 
     private $taxR = null;